The most common and most likely answer to this crossword clue is the 6 letter word DREAMS
I've seen this crossword clue in The Guardian
D
R
E
A
M
S
More clues leading to the result DREAMS
- West road rises above base of clouds in visions
- West caught up in cricket review system fantasies
- About to stop mother’s fantasies
- Duke has loads of fantasies
- Deputy head with masses of paper getting dark thoughts
- Fancies more than one wee drink laced with ecstasy
- Fantasies about mothers overwhelming
- Sleepy has these 500 packs of sheets
- Imagines 500 bundles of paper
- Indulges in fantasies about measures of whisky circling Earth
Buddy explains!

The straight part
We know that "Fantasies" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fantasies = dreams.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DREAMS mean?
DREAMS noun- Imaginary events seen in the mind while sleeping.
- A hope or wish.
- A visionary scheme; a wild conceit; an idle fancy.
- To see imaginary events in one's mind while sleeping.
- To hope, to wish.
- To daydream.
- To envision as an imaginary experience (usually when asleep).
- To consider the possibility (of).